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      • AC Basics
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    • Norton’s Theorem
    • Maximum Power transfer theorem
    • Superposition theorem
  • Machines
    • Transformers
      • Transformer Action
      • Ideal Transformer
      • EMF equation
      • Equivalent circuit and Phasor diagram
      • Voltage regulation
      • Parts of a transformer
      • Transformer tresting
      • Load losses and No-load losses
      • Types
        • Core type and shell type transformers
      • Magnetization current
      • Magnetization inrush
      • High Leg delta connection
      • Buchholz relay
      • Autotransformer
      • Selection
        • Frequently asked questions-1
        • Frequently asked questions-2
        • Frequently asked questions-3
      • Transformer noise
      • Transformer kVA calculator
      • Transformer turns ratio
  • Power system
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What is there inside and MCCB?

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Difference between MCCB and RCCB

Difference between MCCB and RCCB MCCBs and RCCBs are circuit protection devices with two different application. When the former protect against overload and short circuit, the later protects against Residual…

Continue ReadingDifference between MCCB and RCCB

Difference between MCB and MCCB

MCBs and MCCBs have commonly used circuit protection devices. These devices provide protection against overcurrent and short circuits. There are a few difference between MCB and MCCB. Overview of MCB:…

Continue ReadingDifference between MCB and MCCB

Difference between contactor and relay

Contactors and relays are two closely related terms leading to confusions and misinterpretations most of the times. Both of them are electrically operated switches used for control and switching of…

Continue ReadingDifference between contactor and relay

What is ammeter selector switch?

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Ammeter selector switch is basically a normal three position switch. In large Electrical distribution panels, an ammeter is used to monitor the current through each line. (more…)

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Why are potential transformers used in power system?

Why are potential transformers used in power system?

 

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Why are current transformers used in power system?

Why are current transformers used in power system? Protective relays coils and measuring instruments such as an ammeter, watt meter and energy meter are very sensitive devices and cannot be…

Continue ReadingWhy are current transformers used in power system?

What are the basic requirements of a protection system used in a power network or equipment?

The following are the basic requirements of any power system protection system: ReliabilitySimplicitySelectivitySensitivitySpeed of operationEconomy Circuit breaker

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Why the power system is divided into several protections zones?

Why the power system is divided into several protections zones?

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What are the essential components of a protective relay?

What are the essential components of a protective relay? The essential components of a protective relay are the following: 1.       Sensing element. 2.       Comparison element. 3.       Control element   Related…

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